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WO2007066636A1 - Grease composition and bearing - Google Patents

Grease composition and bearing Download PDF

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Publication number
WO2007066636A1
WO2007066636A1 PCT/JP2006/324218 JP2006324218W WO2007066636A1 WO 2007066636 A1 WO2007066636 A1 WO 2007066636A1 JP 2006324218 W JP2006324218 W JP 2006324218W WO 2007066636 A1 WO2007066636 A1 WO 2007066636A1
Authority
WO
WIPO (PCT)
Prior art keywords
acid
mass
oil
grease composition
fatty acid
Prior art date
Application number
PCT/JP2006/324218
Other languages
French (fr)
Japanese (ja)
Inventor
Yutaka Imai
Yuji Oonuki
Atsushi Shibayama
Original Assignee
Kyodo Yushi Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyodo Yushi Co., Ltd. filed Critical Kyodo Yushi Co., Ltd.
Priority to EP06833973.8A priority Critical patent/EP1961801B1/en
Priority to US12/095,888 priority patent/US20110046030A1/en
Publication of WO2007066636A1 publication Critical patent/WO2007066636A1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/02—Mixtures of base-materials and thickeners
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/32—Esters
    • C10M105/38—Esters of polyhydroxy compounds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
    • F16C33/6633—Grease properties or compositions, e.g. rheological properties
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
    • C10M2207/128—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof
    • C10M2207/1285—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof used as thickening agents
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/283—Esters of polyhydroxy compounds
    • C10M2207/2835—Esters of polyhydroxy compounds used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
    • C10M2215/064—Di- and triaryl amines
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/22—Heterocyclic nitrogen compounds
    • C10M2215/223—Five-membered rings containing nitrogen and carbon only
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/04—Groups 2 or 12
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/02—Viscosity; Viscosity index
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/085—Non-volatile compounds
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/02—Bearings
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/10—Semi-solids; greasy

Definitions

  • the item relates to a tok that is suitable for use in rolling bearings, a life-improving gas, and a casing that encloses it.
  • a gas consisting of at least a component selected from pentast () putan () 2 thixane acid and naric acid is disclosed (for example, Patent 2).
  • a gas consisting of at least a component selected from pentast () putan () 2 thixane acid and naric acid is disclosed (for example, Patent 2).
  • It is suitable for rolling at low temperature of 0,000 m, and also provides stable, long-lasting injection for a long time. It is to provide the gas that excels in low temperature life and encapsulates it.
  • the pour point becomes higher and lower when the prime number of the component is higher, while the pour point becomes lower and higher when the prime number is lower.
  • the molecular weight is good when only the minutes are straight, the mobility at low temperatures is poor.
  • low-temperature mobility is poor and the number is low, which is also preferable.
  • the synthetic class is defined as a chain and / or branched chain having a prime number of 6 to 2.
  • the bright gusset is a gusset containing a demulcent containing a particular tetratetrastea oil, and as the pentastetrastea alone, for example, a mineral or a poin It may be used in combination with (PO), a type of starch other than the above-mentioned tetratetrastea, oil, and te oil.
  • Ming-gu preferably, has 5 or more, 5 to 3 additions, and other additions as needed, and has 2 to 35 degrees.
  • the general formula () used in 001 14 is a tetra-strate oil consisting of a specific acid of a pen-stant, which is a chain and / or branched chain having a prime number of 6 to 2, particularly cap, capric acid and 2
  • the total content of xanthic acid is 9 or more. However, it consists of at least 2 xanes 5 to 55, and the combined amount of capcapnic acid is 4 to 49 (however, capric acid is 3 and capnic acid is 5 to 5). More preferably, it is composed of cap 38-4 and cap 6-8 2 xane 52-54.
  • the 015 pentast a commercially available product is generally used, and a purity of 9 or higher is preferable, and that of 95 or higher is more preferable.
  • Some pentasts contain more than one body, such as body and trimer, but these may be used.
  • the qualitative properties, viscosity, viscosity, and kinematics of the Stotestras oil used for the bright oil are significantly improved by using the above-mentioned synthetic compounds. Based on the sto tetrastea oil, it is possible to It has improved in width.
  • the oil used in Mitsumei it may be the above-mentioned tetratote alone or the pentato-tetra-steel oil and / or the stete- or post-representative system.
  • It may be used in combination with at least one of a group such as synthetic hydrogen hydride represented by tin, porphyrin, azite, te system represented by popping, phosphorus, and oil.
  • a group such as synthetic hydrogen hydride represented by tin, porphyrin, azite, te system represented by popping, phosphorus, and oil.
  • Ming Gui 5 above, preferably 6 to 9, the above-mentioned tetratetrastea oil is used, and the proportion of the above mentioned stea oil is 5 above, particularly preferably 7 above. , And more preferred are the 9 most preferred.
  • the viscosity number is above, and the moving point is below 45 C.
  • Examples of 002 include spores represented by thium ken and stendium sap, selenium s represented by jiu, inorganic spores represented by organic squid, representatives of tetratetrachin and lanthanum. It is possible to use at least one selected from these groups.
  • 002 is more preferably selected from the group consisting of titanium sulphate, sodium sulphate, um selenium and aluminium sulphate. Particularly preferred is thium sulphate, eg stearium 2 xt.
  • diuretics are preferred, and they are represented by (2) below. It is something.
  • the a series of agents can be obtained, for example, by reacting a predetermined isoaneto with a predetermined.
  • the isoaneto is specifically dimethane 44 isoaneto.
  • the fatty acid include an aliphatic amine, an amine, an amine, or a mixture thereof.
  • Examples of the body of the fatty acids include octane, methane, oxane, and octane oa.
  • An example of the body is Ann P-toysine.
  • An example of the body is Ku.
  • octane, quinone, xane, octane, or a type of a compound obtained by using a mixture thereof is preferable.
  • the content of the paste of 002 Gyosu is 5 to 3, preferably 6 to 6, and more preferably 9 to 3.
  • additives it is possible to combine two or more of those normally used in gas, such as, anti-corrosion agents, metals, detergents, poles, deodorants, anti-oil agents, and oiliness improvers. It should be noted that these are added according to need, and generally, they are, but are not particularly limited as long as they do not impair the purpose of the invention.
  • the brightness of Ming-gu used to be raw material is preferably 2 to 35, more preferably 23 to 27, which is most suitable for various kinds of encapsulation.
  • the synthesis is performed using a general reaction such as the use of acanthene sulfonic acid.
  • PET 90 () PET 00 PET 100 PET 00 0
  • Execution ⁇ 6 shows the results in the low temperature test .
  • Comparisons-3 show results in either or both low temperature tests.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Lubricants (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

Disclosed is a grease composition containing a base oil and a thickening agent, wherein the base oil contains an ester oil which is composed of pentaerythritol and a fatty acid and represented by the general formula (1) below. This grease composition is characterized by containing a pentaerythritol tetraester oil wherein the fatty acid is composed of at least 51-55% by mass of 2-ethylhexane acid and 39-49% by mass of caprylic acid and capric acid in total (provided that the caprylic acid is not less than 30% by mass and the capric acid is 5-10% by mass). Also disclosed is a bearing in which such a grease composition is sealed. C(CH2OCOR1)4 (1) (In the formula, R1 represents a linear and/or branched fatty acid residue having 6-12 carbon atoms.) The grease composition is suitable for rolling bearings under low temperature conditions and exhibits stable lubricity for a long time.

Description

明 細 書 Specification
グリース組成物及び軸受 Grease composition and bearings
技術分野 Technical field
[0001] 本発明は、エステル油を含有する基油と増ちよう剤を含むグリース組成物に関する [0001] The present invention relates to a grease composition containing a base oil containing an ester oil and a thickener.
。詳しくは、転がり軸受に使用するのに好適な低温トルク性と潤滑寿命を向上したダリ ース組成物、及びこれを封入した軸受に関する。 . More specifically, the present invention relates to a dallis composition suitable for use in rolling bearings with improved low-temperature torque properties and lubrication life, and a bearing containing the same.
背景技術 Background technology
[0002] グリース組成物の低温トルク性と潤滑寿命を向上する為に基油に求められる性能は 、高粘度指数、低温流動性、熱酸ィヒ安定性及び低揮発性などであり、今までにもダリ ース組成物及び基油の性能向上に関する各種の提案が出されている。 [0002] In order to improve the low-temperature torque properties and lubrication life of a grease composition, the properties required of the base oil include a high viscosity index, low-temperature fluidity, thermal acid stability, and low volatility. Various proposals have also been made to improve the performance of dallis compositions and base oils.
[0003] グリース組成物に使用されている基油は、一般的には鉱物油と合成油に大別され る。グリース基油としては、従来力も鉱物油が広く用いられてきている。しかし、鉱物油 は安価であると 、う利点がある反面、低温使用時の潤滑性が著しく悪 、と 、う欠点が ある。 [0003] Base oils used in grease compositions are generally classified into mineral oils and synthetic oils. Mineral oils have traditionally been widely used as grease base oils. However, although mineral oil has the advantage of being inexpensive, it also has the disadvantage of extremely poor lubricity when used at low temperatures.
一方、前記欠点を解消するグリース基油として、近年各種の合成油が開発され用い られている。特に、低温使用時の潤滑性を向上したものとしてペンタエリスリトールと 力プリル酸及び Z又は力プリン酸と 2—ェチルへキサン酸とをその重量比〔（力プリル 酸及び Z又は力プリン酸） Z2—ェチルへキサン酸〕力 OZ20〜50Z50となるよう に混合した酸成分とからなる合成潤滑油基油が開示されている (例えば、特許文献 1 参照)。 On the other hand, in recent years, various synthetic oils have been developed and used as grease base oils that eliminate the above-mentioned drawbacks. In particular, the weight ratio of pentaerythritol to pyropuric acid and Z or pyropuric acid and 2-ethylhexanoic acid to improve lubricity during low-temperature use [(hydroprylic acid and Z or pyropuric acid) Z2 —Ethylhexanoic acid] Synthetic lubricating base oil is disclosed that is composed of an acid component mixed to give a strength of OZ20 to OZ50Z50 (see, for example, Patent Document 1).
また、ペンタエリスリトールと脂肪酸が（Α) η—ヘプタン酸と（Β) 2—ェチルへキサン 酸及び iーノナン酸力 選ばれた少なくとも 1種の分岐脂肪酸とのエステル力 なるグ リース基油が開示されている（例えば、特許文献 2参照)。しかし、これらの基油を使 用したグリースを転がり軸受に利用しても低温流動性等が不十分であり、未だユーザ 一の満足するものは得られて 、な 、のが現状である。 Furthermore, a grease base oil is disclosed in which pentaerythritol and a fatty acid are esters of (A) η-heptanoic acid, (B) 2-ethylhexanoic acid, and at least one selected branched fatty acid. (For example, see Patent Document 2). However, even when greases made from these base oils are used in rolling bearings, low-temperature fluidity, etc., are insufficient, and the current situation is that it has not yet been possible to obtain a product that satisfies users.
[0004] 特許文献 1 :特開平 07 224289 [0004] Patent document 1: Japanese Patent Application Laid-Open No. 07-224289
特許文献 2：特開平 11 80766 発明の開示 Patent Document 2: Unexamined Patent Publication No. 11 80766 Disclosure of invention
発明が解決しょうとする課題 Problems that the invention seeks to solve
[0005] 本発明の課題は、低温下にある転がり軸受に好適であり、また安定した潤滑性を長 期間示すグリース組成物を提供することである。即ち、低温トルク性と潤滑寿命に優 れているグリース組成物とこれを封入した軸受を提供することである。 [0005] An object of the present invention is to provide a grease composition that is suitable for rolling bearings at low temperatures and that exhibits stable lubricity over a long period of time. That is, the object of the present invention is to provide a grease composition that has excellent low-temperature torque properties and a long lubrication life, and a bearing containing the same.
課題を解決するための手段 Means to solve problems
[0006] 本発明者らは上記目的を達成するために鋭意研究の結果、基油に特定のエステ ル油を用いることにより低温トルク性と潤滑寿命を改善し、低温下にある転がり軸受に 好適であり、また安定した潤滑性を長期間示すグリース組成物を完成させた。 [0006] As a result of intensive research to achieve the above object, the present inventors have improved low-temperature torque performance and lubrication life by using a specific ester oil as the base oil, which is suitable for rolling bearings at low temperatures. We have also completed a grease composition that exhibits stable lubricity over a long period of time.
[0007] 本発明は以下に示すグリース組成物及び軸受を提供するものである。 [0007] The present invention provides the following grease composition and bearing.
1.基油と増ちよう剤を含み、基油がペンタエリスリトールと脂肪酸力もなる一般式（1) で表されるエステル油を含むグリース組成物において、前記脂肪酸の組成が、少なく とも 2-ェチルへキサン酸 51〜55質量0 /0、力プリル酸と力プリン酸の合計 39〜49質 量％ (ただし、力プリル酸は 30質量％以上、及び力プリン酸は 5〜10質量％である） 力もなるペンタエリスリトールテトラエステル油を含有することを特徴とするグリース組 成物。 1. In a grease composition containing an ester oil represented by the general formula (1) in which the base oil contains pentaerythritol and a fatty acid, the fatty acid has a composition of at least 2-ethyl. Hexanoic acid 51-55 mass 0 / 0 , total of cycloprilic acid and cyclopurinic acid 39-49 mass% (however, cyclopuric acid is 30 mass% or more, and cyclopurinic acid is 5-10 mass%) ) A grease composition characterized by containing pentaerythritol tetraester oil, which also provides strength.
C(CH OCOR1) (1) C(CH OCOR 1 ) (1)
2 4 twenty four
(式中、 R1は炭素数 6〜12の直鎖及び Z又は分岐の脂肪酸残基を表す） (In the formula, R 1 represents a straight chain and Z or branched fatty acid residue having 6 to 12 carbon atoms)
2.前記脂肪酸の組成が、力プリル酸 38〜41質量％、力プリン酸 6〜8質量％及び 2 -ェチルへキサン酸 52〜54質量％であることを特徴とする上記 1記載のグリース組成 物。 2. The grease composition according to 1 above, wherein the composition of the fatty acids is 38 to 41% by mass of pyropuric acid, 6 to 8% by mass of purolic acid, and 52 to 54% by mass of 2-ethylhexanoic acid. thing.
3.前記ペンタエリスリトールテトラエステル油の動粘度が 40mm2/s以下 (40°C)であ り、粘度指数が 100以上であり、かつ流動点が 45°C以下である上記 1又は 2記載 のグリース組成物。 3. The pentaerythritol tetraester oil described in 1 or 2 above has a kinematic viscosity of 40 mm 2 /s or less (40°C), a viscosity index of 100 or more, and a pour point of 45°C or less. Grease composition.
4.グリース組成物全体に対して、基油 50質量％以上、増ちよう剤 5〜30質量％を含 み、基油が該ペンタエリスリトールテトラエステル油単独又は該ペンタエリスリトールテ トラエステル油とそれ以外の合成油及び Z又は鉱物油との混合物である、上記 1〜3 の!、ずれか 1項記載のグリース組成物。 5.混和ちよう度が 200〜350である上記 1〜4のいずれ力 1項記載のグリース組成物 4. Contains 50% by mass or more of a base oil and 5 to 30% by mass of a thickening agent based on the entire grease composition, and the base oil is a combination of the pentaerythritol tetraester oil alone or the pentaerythritol tetraester oil and the same. The grease composition according to any one of items 1 to 3 above, which is a mixture of a synthetic oil other than Z and mineral oil. 5. The grease composition according to item 1 of 1 to 4 above, having a miscibility of 200 to 350.
6.上記 1〜5のいずれか 1項記載のグリース組成物を封入した軸受。 6. A bearing containing the grease composition according to any one of 1 to 5 above.
発明の効果 Effect of the invention
[0008] 本発明のグリース組成物は、改善された低温トルク性と潤滑寿命を有し、低温下に ある転がり軸受に使用するのに好適であり、また安定した潤滑性を長期間示すため、 非常に有用である。 [0008] The grease composition of the present invention has improved low-temperature torque properties and lubrication life, is suitable for use in rolling bearings at low temperatures, and exhibits stable lubricity over a long period of time. Very useful.
[0009] 従来、エステル系合成油を利用したグリース組成物とこれを封入した軸受において 、脂肪酸の種類と配合を特定することにより、高粘度指数、低温流動性、熱酸化安定 性及び低揮発性が向上したエステル油、及びそのエステル油を基油に用いて、低温 トルク性と潤滑寿命が大幅に向上したグリース組成物に関する提案はされておらず、 極めて有用な発明と言える。 [0009] Conventionally, in grease compositions using ester-based synthetic oils and bearings sealed with the same, by specifying the type and composition of fatty acids, high viscosity index, low-temperature fluidity, thermal oxidation stability, and low volatility have been achieved. There have been no proposals regarding ester oils with improved ester oils or grease compositions that use the ester oils as base oils to significantly improve low-temperature torque performance and lubrication life, and this invention can be said to be extremely useful.
[0010] 本発明は、ペンタエリスリトールと脂肪酸のエステルにおいて、脂肪酸の種類とその 混合割合、直鎖成分と分岐成分との比率などを特定することにより、熱酸化安定性を 損なうことなぐ著しく粘度指数及び低温流動性が向上するという知見に基づいてな されたものである。 [0010] The present invention provides an ester of pentaerythritol and a fatty acid that has a significantly lower viscosity index without impairing thermal oxidative stability by specifying the type of fatty acid, its mixing ratio, the ratio of linear components to branched components, etc. This was based on the knowledge that low-temperature fluidity is improved.
[0011] すなわち、ペンタエリスリトールと脂肪酸成分とのエステルにおいて、脂肪酸成分の 炭素数が高くなると流動点は高くなり蒸発減量は低くなる、反面炭素数が低くなると 流動点は低くなり蒸発減量は高くなる。また、脂肪酸成分が直鎖成分だけでは分子 の対称性が良いために結晶化してしまい、低温における流動性が悪くなる。また、脂 肪酸成分が分岐成分だけでも低温における流動性が悪くなり、また粘度指数も低く なり好ましくない。 [0011] In other words, in an ester of pentaerythritol and a fatty acid component, as the number of carbon atoms in the fatty acid component increases, the pour point increases and the evaporation loss decreases.On the other hand, as the carbon number decreases, the pour point decreases and the evaporation loss increases. . In addition, if the fatty acid component is only a straight chain component, the molecules tend to have good symmetry and will crystallize, resulting in poor fluidity at low temperatures. Furthermore, if the fatty acid component is only a branched component, the fluidity at low temperatures will be poor and the viscosity index will also be low, which is undesirable.
[0012] このような知見から、本発明のグリース組成物に用いるペンタエリスリトールテトラエ ステル油では、合成に用いる脂肪酸の種類を炭素数 6〜12の直鎖及び Z又は分岐 の脂肪酸としている。 [0012] Based on this knowledge, in the pentaerythritol tetraester oil used in the grease composition of the present invention, the types of fatty acids used in the synthesis are linear and Z or branched fatty acids having 6 to 12 carbon atoms.
特に、力プリル酸、力プリン酸及び 2—ェチルへキサン酸についてはその混合割合 を特定することにより、そのペンタエリスリトールテトラエステル油の熱酸ィ匕安定性を損 なうことなぐ粘度指数及び低温流動性が向上している。この特定のペンタエリスリト ールテトラエステル油を含有する基油を用いたことにより、本発明のグリース組成物の 低温トルク性と潤滑寿命が向上したものであると考えられる。 In particular, by specifying the mixing ratio of pyrolytic acid, pyropuric acid, and 2-ethylhexanoic acid, it is possible to improve the viscosity index and low temperature without impairing the thermal acidity stability of the pentaerythritol tetraester oil. Liquidity is improving. This particular pentaerythritol It is believed that the low-temperature torque properties and lubrication life of the grease composition of the present invention were improved by using the base oil containing tetraester oil.
発明を実施するための最良の形態 BEST MODE FOR CARRYING OUT THE INVENTION
[0013] 以下本発明について詳細に説明する。 [0013] The present invention will be explained in detail below.
本発明のグリース組成物は、前記したように、特定のペンタエリスリトールテトラエス テル油を含有する基油と増ちよう剤を含むグリース組成物であって、基油として、ペン タエリスリトールテトラエステル油単独でも良いし、例えば、鉱物油、ポリ a -ォレフイン As described above, the grease composition of the present invention is a grease composition containing a base oil containing a specific pentaerythritol tetraester oil and a thickening agent, wherein the base oil is a pentaerythritol tetraester oil. It can be used alone, for example, mineral oil, poly( a -phorefin)
(PAO)、前記のペンタエリスリトールテトラエステル油以外のエステル油、シリコン油 、エーテル油などの各種の合成油と併用して、使用してもよい。 (PAO), ester oil other than the above-mentioned pentaerythritol tetraester oil, silicone oil, ether oil, and various other synthetic oils may be used in combination.
本発明のグリース組成物は、好ましくは、基油 50質量％以上、増ちよう剤 5〜30質 量％及びその他の添加剤を必要に応じて含有し、混和ちよう度が 200〜350である ものである。 The grease composition of the present invention preferably contains 50% by mass or more of a base oil, 5 to 30% by mass of a thickener, and other additives as necessary, and has a miscibility of 200 to 350. It is something.
[0014] 基油に用いられる一般式（1)で表されるペンタエリスリトールテトラエステル油は、ぺ ンタエリスリトールと特定の脂肪酸力もなり、その脂肪酸は炭素数 6〜 12の直鎖及び Z又は分岐の脂肪酸であり、特に力プリル酸、力プリン酸及び 2—ェチルへキサン酸 を合計含有量で 90質量％以上含むものである。その脂肪酸の組成は、少なくとも 2- ェチルへキサン酸 51〜55質量％、力プリル酸と力プリン酸の合計含有量力 0〜49 質量％(ただし、力プリル酸は 30%以上、及び力プリン酸は 5〜10質量％である）か らなる。好ましくは力プリル酸 38〜41質量％、力プリン酸 6〜8質量％及び 2-ェチル へキサン酸 52〜54質量％からなる脂肪酸組成である。 [0014] The pentaerythritol tetraester oil represented by the general formula (1) used as a base oil also contains pentaerythritol and specific fatty acids, and the fatty acids are linear and Z or branched fatty acids with 6 to 12 carbon atoms. It is a fatty acid, and in particular contains 90% by mass or more of hydroprylic acid, hydrpuric acid, and 2-ethylhexanoic acid in total. The composition of the fatty acids is at least 51-55% by weight of 2-ethylhexanoic acid, the total content of hydroprylic acid and pyropuric acid 0-49% by weight (however, 30% or more of hydroprylic acid, and hydrpuric acid of 0-49% by weight) is 5 to 10% by mass). Preferably, the fatty acid composition is 38 to 41% by mass of pyropuric acid, 6 to 8% by mass of pyropuric acid, and 52 to 54% by mass of 2-ethylhexanoic acid.
[0015] ペンタエリスリトールとしては、一般に市販されて!、る高純度品が用いられ、純度と しては 90%以上のものが好ましぐ 95%以上のものがさらに好ましい。ペンタエリスリ トールの市販品には二量体や三量体など、二量体以上を含有したものもある力 これ らを使用しても良い。 [0015] As pentaerythritol, commercially available high-purity products are used, and the purity is preferably 90% or more, more preferably 95% or more. Some commercially available pentaerythritol products contain dimers and trimers, and these may also be used.
[0016] 本発明のグリース組成物に使用するペンタエリスリトールテトラエステル油は、合成 原料に前記の脂肪酸組成のものを用いることにより、熱安定性、耐酸化性、粘度指 数及び低温流動性が大幅に向上して 、る。そのペンタエリスリトールテトラエステル油 を基油として用いることにより、本発明のグリース組成物の低温トルク性と潤滑寿命が 大幅に向上している。 [0016] The pentaerythritol tetraester oil used in the grease composition of the present invention has significantly improved thermal stability, oxidation resistance, viscosity index, and low-temperature fluidity by using the fatty acid composition described above as a synthetic raw material. Improved. By using the pentaerythritol tetraester oil as a base oil, the low-temperature torque properties and lubrication life of the grease composition of the present invention can be improved. It has improved significantly.
[0017] 本発明のグリース組成物に使われる基油としては、前記のペンタエリスリトールテト ラエステル油単独でも良いし又は該ペンタエリスリトールテトラエステル油と鉱物油及 び Z又はエステル、ポリオールエステルに代表されるエステル系合成油、ポリ a -ォレ フィン、ポリブテンに代表される合成炭化水素油、アルキルジフエ-ルエーテル、ポリ プロピレングリコールに代表されるエーテル系合成油、シリコン油、フッ素化油などの 群の少なくとも 1種類の合成油と併用して、使用してもよ!、。 [0017] The base oil used in the grease composition of the present invention may be the above-mentioned pentaerythritol tetraester oil alone, or the pentaerythritol tetraester oil, mineral oil, Z or ester, and polyol ester. At least one of the following groups: ester-based synthetic oils, poly(a-olefins), synthetic hydrocarbon oils represented by polybutene, alkyl diphenol ethers, ether-based synthetic oils represented by polypropylene glycol, silicone oils, fluorinated oils, etc. You can also use it in conjunction with various synthetic oils!
[0018] 前記一般式（1)で表されるペンタエリスリトールテトラエステル系合成油は熱酸ィ匕安 定性、粘度指数及び低温流動性が向上し、その特定のペンタエリスリトールテトラエ ステル油からなる基油をグリース組成物に配合することにより、低温トルク性と潤滑寿 命が大幅に改善する。 [0018] The pentaerythritol tetraester synthetic oil represented by the general formula (1) has improved thermal acidity stability, viscosity index, and low-temperature fluidity, and the pentaerythritol tetraester oil has improved thermal stability, viscosity index, and low-temperature fluidity. By incorporating oil into the grease composition, low-temperature torque performance and lubrication life are significantly improved.
[0019] 本発明のグリース組成物では、基油を 50質量％以上、好ましくは 60〜90質量％、 含み、その基油中には前記のペンタエリスリトールテトラエステル油が用いられ、その 基油中のエステル油の割合が 50質量％以上であり、特に好ましくは 70質量％以上 であり、更に好ましくは 90質量％以上、最も好ましくは 100質量％含有したものであ る。 [0019] The grease composition of the present invention contains 50% by mass or more of a base oil, preferably 60 to 90% by mass, and the above-mentioned pentaerythritol tetraester oil is used in the base oil. The content of ester oil is 50% by mass or more, particularly preferably 70% by mass or more, even more preferably 90% by mass or more, and most preferably 100% by mass.
[0020] 本発明では、前記のペンタエリスリトールテトラエステル油の 40°Cにおける動粘度 は好ましくは、 40mm2/s以下であり、粘度指数が 100以上であり、かつ流動点が 4 5°C以下である。 [0020] In the present invention, the kinematic viscosity at 40°C of the pentaerythritol tetraester oil is preferably 40 mm 2 /s or less, the viscosity index is 100 or more, and the pour point is 45°C or less. It is.
[0021] 増ちよう剤としては、リチウム石けんや複合リチウム石けんに代表される石けん系増 ちょう剤、ジゥレアに代表されるゥレア系増ちよう剤、有機化クレイやシリカに代表され る無機系増ちよう剤、ポリテトラフルォロエチレン、及びメラミンシァヌレートに代表され る有機系増ちよう剤等が挙げられ、これらの群力も選ばれる少なくとも一種を使用する ことが出来る。 [0021] Thickeners include soap-based thickeners such as lithium soap and complex lithium soap, urea-based thickeners such as urea, and inorganic thickeners such as organic clay and silica. Examples include organic thickeners represented by thickening agents, polytetrafluoroethylene, and melamine cyanurate, and at least one selected from these thickening agents can be used.
[0022] 好ましくは、リチウム石けん、ナトリウム石けん、カルシウム石けん、アルミニウム石け ん及びウレァ化合物力 なる群力 選ばれる。特に好ましいのは、リチウム石けん、例 えば、ステアリン酸リチウムや 12—ヒドロキシステアリン酸リチウムである。 [0022] Lithium soap, sodium soap, calcium soap, aluminum soap and urea compound are preferably selected. Particularly preferred are lithium soaps, such as lithium stearate and lithium 12-hydroxystearate.
[0023] また、ゥレア化合物では、ジゥレア系増ちよう剤が好ましぐ下記一般式 (2)で表され るものである。 [0023] Among urea compounds, urea-based thickeners are preferably represented by the following general formula (2). It is something that
R2- NHCONH- R3- NHCONH- R4 (2) R 2 - NHCONH- R 3 - NHCONH- R 4 (2)
R4は同一もしくは異なる炭素数 4〜20の 1価の炭化水素残基を示し、例えば脂 肪族炭化水素基、脂環式炭化水素基、芳香族炭化水素基である。 R3は炭素数 6〜1 5の 2価の芳香族炭化水素基を示し、例えば、下記一般式（3)〜（5)で表されるもの R 4 represents the same or different monovalent hydrocarbon residues having 4 to 20 carbon atoms, such as an aliphatic hydrocarbon group, an alicyclic hydrocarbon group, or an aromatic hydrocarbon group. R 3 represents a divalent aromatic hydrocarbon group having 6 to 15 carbon atoms, such as those represented by the following general formulas (3) to (5).
Figure imgf000007_0001
Figure imgf000007_0001
Figure imgf000007_0002
Figure imgf000007_0002
上記ジゥレア系増ちよう剤は、例えば、所定のジイソシァネートと、所定のモノアミン とを反応させることにより得ることができる。ジイソシァネートは、具体的には、ジフエ- ルメタン- 4, 4， -ジイソシァネートである。モノアミンとしては、脂肪族ァミン、芳香族ァ ミン、脂環式ァミン又はこれらの混合物が挙げられる。脂肪族ァミンの具体例としては 、ォクチルァミン、ドデシルァミン、へキサデシルァミン、ォクタデシルァミン及びォレイ ルァミンが挙げられる。芳香族ァミンの具体例としては、ァ-リン及び P-トルィジンが 挙げられる。脂環式ァミンの具体例としては、シクロへキシルァミンが挙げられる。上 述したモノアミンのうち、ォクチルァミン、ドデシルァミン、へキサデシルァミン、ォクタ デシルァミン又はこれらの混合物を用いて得られるジゥレア系増ちよう剤が好ましい。 [0025] 本発明のグリース組成物中の増ちよう剤の含有量は 5〜30質量％であり、好ましく は 6〜16質量％であり、更に好ましくは 9〜13質量％である。 The above diurea thickener can be obtained, for example, by reacting a predetermined diisocyanate with a predetermined monoamine. Specifically, the diisocyanate is diphelmethane-4,4-diisocyanate. Monoamines include aliphatic amines, aromatic amines, cycloaliphatic amines, or mixtures thereof. Specific examples of aliphatic amines include octylamine, dodecylamine, hexadecylamine, octadecylamine, and oleylamine. Specific examples of aromatic amines include alin and P-toludine. A specific example of the alicyclic amine is cyclohexylamine. Among the above-mentioned monoamines, diurea-based thickeners obtained using octylamine, dodecylamine, hexadecylamine, octadecylamine, or mixtures thereof are preferred. [0025] The content of the thickening agent in the grease composition of the present invention is 5 to 30% by mass, preferably 6 to 16% by mass, and more preferably 9 to 13% by mass.
[0026] その他の添加剤としては、酸化防止剤、防鲭剤、金属不活性化剤、清浄分散剤、 極圧添加剤、消泡剤、抗乳化剤、油性向上剤など、グリースで通常使用される添カロ 剤を単独又は 2種以上混合して用いることができる。なお、これら添加剤は必要に応 じて添加され、その添加量は、一般的には 0. 01〜： LO質量％である力 本発明の目 的を損なわな 、程度であれば特に限定されるものではな 、。 [0026] Other additives commonly used in grease include antioxidants, anti-mildew agents, metal deactivators, detergent dispersants, extreme pressure additives, antifoaming agents, demulsifiers, and oiliness improvers. These additives can be used alone or in combination of two or more. Note that these additives are added as necessary, and the amount added is generally limited to 0.01 to LO mass%. It's not like that.
[0027] このような原料を使用して造られた本発明のグリース組成物の混和ちよう度は好まし く ίま 200〜350、さら【こ好ましく ίま 230〜270であり、各種の軸受を封人するの【こ最 適である。 [0027] The miscibility of the grease composition of the present invention made using such raw materials is preferably 200 to 350, more preferably 230 to 270, and is suitable for various bearings. It is most suitable to enshrine.
[0028] 以下、実施例によって本発明をさらに詳述するが、下記の実施例は本発明を制限 するものでなぐ本発明の趣旨を逸脱しない範囲で変更実施することは全て本発明 の技術範囲に包含される。 [0028] Hereinafter, the present invention will be explained in more detail with reference to examples, but the following examples do not limit the present invention, and all changes and implementations within the scope of the spirit of the present invention are within the technical scope of the present invention. included in
実施例 Example
[0029] 1.試験用グリース [0029] 1. Test grease
配合処方は、表 1に実施例 1〜6を、表 2と表 3に比較例 1〜13を示す。 The formulations are shown in Examples 1 to 6 in Table 1, and Comparative Examples 1 to 13 in Tables 2 and 3.
[0030] 2.ペンタエリスリトールテトラエステル油の合成 [0030] 2. Synthesis of pentaerythritol tetraester oil
ペンタエリスリトールと脂肪酸を原料にして、アルキルベンゼンスルフォン酸などの 酸触媒を用いた一般的な脱水化反応でエステル合成を行う。 Ester synthesis is performed using pentaerythritol and fatty acids as raw materials through a general dehydration reaction using an acid catalyst such as alkylbenzenesulfonic acid.
[0031] 3.グリースの製造方法 [0031] 3. Grease manufacturing method
基油、増ちよう剤を容器に計量、 230°Cまで加熱し、冷却する。冷却後、所定量の 添加剤を加えて良く混ぜ、 3本ロールミルで混練した後、ニーダ一にてちょう度を 230 Weigh base oil and thickener into a container, heat to 230°C, and cool. After cooling, add a predetermined amount of additives and mix well. After kneading with a three-roll mill, the consistency is set to 230 in a kneader.
〜270に調整、脱泡してグリース組成物を得た。 The grease composition was adjusted to ~270 and defoamed to obtain a grease composition.
[0032] 4.分析方法及び評価試験方法 [0032] 4. Analysis method and evaluation test method
JIS K2283に規定された「原油及び石油製品の動粘度試験方法並びに石油製品 粘度指数算出方法」により行う。 Performed according to the "Kinematic viscosity test method for crude oil and petroleum products and petroleum product viscosity index calculation method" stipulated in JIS K2283.
義点、 JIS K2269に規定された「原油及び石油製品の流動点並びに石油製品曇り点試験 方法」により行う。 righteous point, This test is performed according to the "Pour point and cloud point test method for crude oil and petroleum products" stipulated in JIS K2269.
碰 Ink
ガラスビーカー（100ml)に試験油 50gを精秤し、これを 150°Cの空気循環型恒温槽 に 500時間静置後、試験油の重量変化を測定し、蒸発減量 (mass.%)を算出する。 低温トルク試験 Precisely weigh 50g of the test oil in a glass beaker (100ml), leave it in a 150°C air circulation constant temperature bath for 500 hours, measure the weight change of the test oil, and calculate the evaporation loss (mass.%). do. Low temperature torque test
JIS K 2220.18に規定された「低温トルク試験方法」により行う。 Performed according to the "low temperature torque test method" specified in JIS K 2220.18.
漏寿命碰 leakage life list
ASTM D 3336に準拠した試験方法で行う。試験は 150°Cで行い、潤滑寿命を時間（ h)で表示する。 Test method conforming to ASTM D 3336. The test is carried out at 150°C and the lubrication life is expressed in hours (h).
[0033] 5.評価試験の結果 [0033] 5. Evaluation test results
表 4、表 5に実施例 1〜6及び表 5〜表 7に比較例 1〜 13を示す。 Examples 1 to 6 are shown in Table 4 and Table 5, and Comparative Examples 1 to 13 are shown in Tables 5 to 7.
[0034] [表 1] [0034] [Table 1]
実施例配合処方 （質量％) Example formulation (mass%)
Figure imgf000009_0001
Figure imgf000009_0001
[0035] [表 2] [0035] [Table 2]
比較例配合処方 （質量％) 比較例 No 1 2 3 4 5 6 Comparative example formulation (mass%) Comparative example No 1 2 3 4 5 6
PET油 PET oil
基油 鉱物油 Base oil Mineral oil
PA0 ― ― ― ― ― ― 增ちょ う剤 12 - t '口キシステアリン酸 !Jチウム 1 1 . 00 PA0 ― ― ― ― ― Thickening agent 12 - t'Stearic acid!JThium 1 1.00
酸化防止剤※1 1 . 80 Antioxidant* 1 1.80
添加剤 防锖剤 2 1 . 00 Additives Anti-mold agent 2 1.00
金属不活性化剤 0. 05 [表 3] Metal deactivator 0.05 [Table 3]
比較例配合処方 Comparative example formulation
Figure imgf000010_0001
Figure imgf000010_0001
※ェ 酸化防止剤：アルキルジフヱ-ルァミン ※ 防鲭剤：ジノニルナフタレンスルホン酸バリウム*Antioxidant: Alkyl diphthalamine *Anti-mildew agent: Barium dinonylnaphthalene sulfonate
※3 金属不活性化剤：ベンゾトリアゾール *3 Metal deactivator: benzotriazole
[表 4] [Table 4]
実施例の評価試験結果 Evaluation test results of examples
Figure imgf000011_0001
表 5] 比較例の評価試験結果
Figure imgf000011_0001
Table 5] Evaluation test results for comparative examples
Figure imgf000012_0001
表 6]
Figure imgf000012_0001
Table 6]
比較例の評価試験結果 Evaluation test results for comparative examples
Figure imgf000013_0001
表 7] 比較例の評価試験結果
Figure imgf000013_0001
Table 7] Evaluation test results for comparative examples
合合口 Aiguchi
格格格 case case
Figure imgf000014_0001
Figure imgf000014_0001
PET :本発明のペンタエリスリトールテトラエステル油 PET: Pentaerythritol tetraester oil of the present invention
[0041] 評価某準 [0041] Evaluation level
低温流動性 〇 ： 流動点 45. (TC以下、 ： 流動点 45. (TC超 〇 ： 減量 4. 0質量％以下、 ： 減量 4. 0質量 °/。超 低温トルク 起動 トルク 500mNm以下、 不合格： 500mNm超 Low temperature fluidity 〇: Pour point 45. (below TC, : pour point 45. (over TC) 〇: Weight loss 4. 0 mass% or less, : Weight loss 4. 0 mass °/.Ultra low temperature torque Starting torque 500mNm or less, Rejected : More than 500mNm
回転卜ノレク l OOmNm以下、 不合格： lOOmNm超 Rotating torque l OOmNm or less, fail: over lOOmNm
軸受潤滑弄命 700h超、 不合格 ： 700h以下 Bearing lubrication failure: over 700 hours, failure: 700 hours or less
[0042] 試験結果 [0042] Test results
実施例 1〜6は、低温トルク及び軸受潤滑寿命の両試験で良好な結果を示して!/、る 。これに対して、比較例 1〜13は低温トルクと軸受潤滑寿命のどちらか又は両方の試 験で悪 、結果を示して 、る。 Examples 1 to 6 showed good results in both low-temperature torque and bearing lubrication life tests. . On the other hand, Comparative Examples 1 to 13 showed poor results in either or both of the low-temperature torque and bearing lubrication life tests.

Claims

請求の範囲 The scope of the claims
[1] 基油と増ちよう剤を含み、基油がペンタエリスリトールと脂肪酸力もなる一般式（1)で 表されるエステル油を含むグリース組成物において、前記脂肪酸の組成が、少なくと も 2-ェチルへキサン酸 51〜55質量％、力プリル酸と力プリン酸の合計 39〜49質量 % (ただし、力プリル酸は 30質量％以上、及び力プリン酸は 5〜10質量％である）か らなるペンタエリスリトールテトラエステル油を含有することを特徴とするグリース組成 物。 [1] A grease composition containing an ester oil represented by the general formula (1) in which the base oil also contains pentaerythritol and a fatty acid, which contains a base oil and a thickening agent, wherein the fatty acid composition is at least 2 -Ethylhexanoic acid 51-55% by mass, total of pyroprilic acid and pyropurinic acid 39-49% by mass (however, pyroprilic acid is 30% by mass or more, and pyropurinic acid is 5-10% by mass) A grease composition comprising a pentaerythritol tetraester oil consisting of:
C(CH OCOR1) (1) C(CH OCOR 1 ) (1)
2 4 twenty four
(式中、 R1は炭素数 6〜12の直鎖及び Z又は分岐の脂肪酸残基を表す） (In the formula, R 1 represents a straight chain and Z or branched fatty acid residue having 6 to 12 carbon atoms)
[2] 前記脂肪酸の組成が、力プリル酸 38〜41質量％、力プリン酸 6〜8質量％及び 2- ェチルへキサン酸 52〜54質量％であることを特徴とする請求項 1記載のグリース組 成物。 [2] The fatty acid according to claim 1, wherein the composition of the fatty acid is 38 to 41% by mass of hydroprylic acid, 6 to 8% by mass of pyropuric acid, and 52 to 54% by mass of 2-ethylhexanoic acid. Grease composition.
[3] 前記ペンタエリスリトールテトラエステル油の動粘度が 40mm2/s以下 (40°C)であり 、粘度指数が 100以上であり、かつ流動点が—45°C以下である請求項 1又は 2記載 のグリース組成物。 [3] Claim 1 or 2, wherein the pentaerythritol tetraester oil has a kinematic viscosity of 40 mm 2 /s or less (40°C), a viscosity index of 100 or more, and a pour point of -45°C or less. Grease composition as described.
[4] グリース組成物全体に対して、基油 50質量％以上、増ちよう剤 5〜30質量％を含 み、基油が該ペンタエリスリトールテトラエステル油単独又は該ペンタエリスリトールテ トラエステル油とそれ以外の合成油及び Z又は鉱物油との混合物である、請求項 1 〜3の!、ずれ力 1項記載のグリース組成物。 [4] The entire grease composition contains 50% by mass or more of a base oil and 5 to 30% by mass of a thickener, and the base oil is combined with the pentaerythritol tetraester oil alone or with the pentaerythritol tetraester oil. The grease composition according to claim 1, which is a mixture with other synthetic oil and Z or mineral oil.
[5] 混和ちよう度が 200〜350である請求項 1〜4のいずれか 1項記載のグリース組成 物。 [5] The grease composition according to any one of claims 1 to 4, having a miscibility of 200 to 350.
[6] 請求項 1〜5の 、ずれか 1項記載のグリース組成物を封入した軸受。 [6] A bearing encapsulated with the grease composition according to any one of claims 1 to 5.
PCT/JP2006/324218 2005-12-05 2006-12-05 Grease composition and bearing WO2007066636A1 (en)

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CN101812350A (en) * 2009-12-18 2010-08-25 益田润石（北京）化工有限公司 Preparation of high-speed bearing grease
JP5727276B2 (en) 2011-03-04 2015-06-03 協同油脂株式会社 Grease composition and grease-filled rolling bearing
JP5764018B2 (en) * 2011-09-16 2015-08-12 協同油脂株式会社 Grease composition
JP7328663B2 (en) * 2018-07-31 2023-08-17 株式会社ハーベス Grease composition, multi-base oil grease composition, lubricant composition, polypropylene resin member
JP7216563B2 (en) * 2019-02-12 2023-02-01 花王株式会社 Grease base oil and grease composition containing the grease base oil
RU2769692C1 (en) * 2021-04-23 2022-04-05 Акционерное общество "Государственный Ордена Трудового Красного Знамени научно-исследовательский институт химии и технологии элементоорганических соединений" (АО "ГНИИХТЭОС") Universal grease
KR102656455B1 (en) * 2023-05-03 2024-04-11 유인재 Tetraester compound for using eco-friendly transformer oils and and lubricants and the manufacturing method of it

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US20110046030A1 (en) 2011-02-24
EP1961801A1 (en) 2008-08-27
EP1961801A4 (en) 2009-02-25
JP2007154032A (en) 2007-06-21
EP1961801B1 (en) 2014-06-04
KR20080069246A (en) 2008-07-25
CN105062614A (en) 2015-11-18
CN101321851A (en) 2008-12-10
KR100988948B1 (en) 2010-10-20

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